Developing a Wiring Diagram. The same basic procedure is used to develop a wiring diagram from the schematic as was followed in the previous chapters.. mon on alarm systems) to 85 (or 86),and 12-volt CONSTANT to the other pin (86 or 85). Basically,it doesn’t matter whether pin 85 or 86 is used for ground or 12 volt if the relay does. This correlates to the following in the relay: Terminal Descriptions. COIL- This is one end of the coil. COIL- This is the other end of the coil.These are the terminals where you apply voltage to in order to give power to the coils (which then will close the switch)..

About hugh I live off-grid in NW Scotland and have spent my life playing with wind turbines. I also love small hydros. Hands on renewable energy is my thing and I like to learn and to share my experiences.. 39.1.5 Light-dependent resistor (LDR) See diagram 39.1.5: Light-dependent resistor (LDR) Use a light dependent resistor in series with a LED and a battery. If the LED is covered or uncovered, the current will flow in either direction as with an ordinary resistor..